123212201111 has 2 divisors, whose sum is σ = 123212201112. Its totient is φ = 123212201110.

The previous prime is 123212201087. The next prime is 123212201113. The reversal of 123212201111 is 111102212321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123212201111 - 2²² = 123208006807 is a prime.

Together with 123212201113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123212201111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123212201113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61606100555 + 61606100556.

It is an arithmetic number, because the mean of its divisors is an integer number (61606100556).

Almost surely, 2^123212201111 is an apocalyptic number.

123212201111 is a deficient number, since it is larger than the sum of its proper divisors (1).

123212201111 is an equidigital number, since it uses as much as digits as its factorization.

123212201111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 123212201111 its reverse (111102212321), we get a palindrome (234314413432).

The spelling of 123212201111 in words is "one hundred twenty-three billion, two hundred twelve million, two hundred one thousand, one hundred eleven".